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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Considering that you want to sell subscriptions and to have donation field inside of your form you would need to Create a Basic Multiple Payment form. Inside of this guide you can find out how to do it: https://www.jotform.com/help/182-How-to-Create-a-Basic-Multiple-Payment-form
Hope this will help. Let us know if you need further assistance.
Thank you, however I am having trouble setting this up. I need to have the subscriptions (recurring payment) and the donation both payable by paypal. Is this possible? Can you help with setting this up?
Unfortunately, you cannot combine product based payment, subscription or donation in a form. So, in this case, you have to create two forms. One for subscription and one for donation. Then you can combine the two in a single form and let users select the type of payment they want.
That guide that is given by my colleague will help you create the forms, but I will try to do it later to your account and let you know here.